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Weinstein–Sobolev Spaces of Exponential Type and Applications

Acta Mathematica Sinica,English Series 2013年第3期29卷 591-608页

作者： Hassen BEN MOHAMED belgacem ghribi Department of Mathematics Faculty of Sciences of Gabs

In this paper, we introduce and study the Sobolev spaces of exponential type associated with the Weinstein operator, via some elements of harmonic analysis related to this operator. In particular, some properties, including completeness and imbedding theorem, are proved. Finally, using the theory of reproducing kernels, some applications are given for these spaces.

关键词： Weinstein operator Weinstein transform distribution Sobolev spaces

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A COMPOUND POISSON MODEL FOR LEARNING DISCRETE BAYESIAN NETWORKS

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Acta Mathematica Scientia 2013年第6期33卷 1767-1784页

作者： Abdelaziz ghribi Afif MASMOUDI Laboratory of Physic-Mathematics University of Sfax Laboratory of Probability and Statistics University of Sfax

We introduce here the concept of Bayesian networks, in compound Poisson model, which provides a graphical modeling framework that encodes the joint probability distribution for a set of random variables within a directed acyclic graph. We suggest an approach proposal which offers a new mixed implicit estimator. We show that the implicit approach applied in compound Poisson model is very attractive for its ability to understand data and does not require any prior information. A comparative study between learned estimates given by implicit and by standard Bayesian approaches is established. Under some conditions and based on minimal squared error calculations, we show that the mixed implicit estimator is better than the standard Bayesian and the maximum likelihood estimators. We illustrate our approach by considering a simulation study in the context of mobile communication networks.

关键词： Bayesian network compound Poisson distribution multinomial distribution implicit approach mobile communication networks

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Fixed Point Theorems for(p, q)-Quasi-Contraction Mappings in Cone Metric Spaces

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Chinese Annals of Mathematics,Series B 2016年第2期37卷 211-220页

作者： Wajdi CHAKER Abdelaziz ghribi Aref JERIBI Bilel KRICHEN Higher Institute of Applied Biology Medenine El Jorf Road Km 22MedenineTunisia Higher Institute of Business Administration of Sfax Airport Road Km 4 B.P.N1013 3018 B.P.1013SfaxTunisia Department of Mathematics Faculty of Science of SfaxSoukra Road Km 3.5B.P.11713000SfaxTunisia Department of Mathematics Preparatory Engineering InstituteMenzel Chaker Road Km 0.5B.P.1172-3018SfaxTunisia

In this work, the authors introduce the concept of(p, q)-quasi-contraction mapping in a cone metric space. We prove the existence and uniqueness of a fixed point for a(p, q)-quasi-contraction mapping in a complete cone metric space. The results of this paper generalize and unify further fixed point theorems for quasi-contraction, convex contraction mappings and two-sided convex contraction of order 2.

关键词： Fixed points (p q)-Quasi-contractions Cone metric space

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Tracking the maximum power point of solar panels through direct estimation of optimum voltage with temperature

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Clean Energy 2024年第4期8卷 135-146页

作者： Mohammed El Bachir ghribi Luis Garcia-Gutierrez Zine Eddine Touhami Ternifi Zhixue Zheng Ghalem Bachir Michel Aillerie Applied Power Electronics Laboratory(LEPA) University of Science and Technology of Oran Mohamed BoudiafOranAlgeria Laboratoire Matériaux Optiques Photonique et Systèmes(LMOPS)Universitéde LorraineCentraleSupélecF-57000 MetzFrance Laboratory of Sustainable Development of the Electrical Energy(LDDEE) University of Science and Technology of Oran Mohamed BoudiafOranAlgeria

Electricity production from photovoltaic(PV)panels is maximized when the operating point is located at the maximum power point thanks to dedicated *** controllers are driven to track the maximum power by using various algorithms within distributed or centralized architectures accounting for factors such as partial irradiation and temperature *** effect of irradiance on the optimal panel voltage is weak or even negligible,while it is strong and quasi-linear-dependent on *** on this observation,this article introduces a straightforward method for tracking the maximum power of a PV panel by using an optimizer,focusing solely on its temperature response as an input *** proposed approach hinges on linearizing the relationship between panel temperature and operating *** relationship enables the estimation of the maximum power point through temperature measurement ***,after determination of the linear temperature coefficient of the voltage requiring only the knowledge of two optimal voltages at different temperatures,for example from the datasheet of the panel,the power tracking involves only one temperature sensor placed on the panel alongside a voltage sensor for *** principle,modelling,and validation post-panel ageing of the method are detailed in this ***,conducted using real experimental irradiation and temperature data,attests to the effectiveness of the *** indicate an average effectiveness of the method of>99.1%in tracking the maximum power,with the panel generating 2.33 kWh out of a possible 2.35 *** performance is comparable to that of tracking devices employing more complex *** simplicity and efficiency of the method make it a promising option for maximizing the power production at low cost from PV systems in small or residential,on-or off-grid connected applications.

关键词： photovoltaic maximum power point tracking hysteresis efficiency

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Anti-inflammatory and analgesic activities with gastroprotective effect of semi-purified fractions and isolation of pure compounds from Mediterranean gorgonian Eunicella singularis

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Asian Pacific Journal of Tropical Medicine 2015年第8期8卷 598-603页

作者： Monia Deghrigue Carmen Festa Lotfi ghribi Maria Valeria D’Auria Simona De Marino Hichem Ben Jannet Abderrahman Bouraoui Laboratoire de développement chimique galénique et pharmacologique des médicaments (LR12ES09).Equipe de Pharmacologie marineFaculté de pharmacie de MonastirUniversité de Monastir Department of Pharmacy University of Naples "Federico II" Laboratoire de chimie hétérocyclique produits naturels et réactivité. Equipe de chimie médicinale et produits naturels (LR11ES39)Faculté des sciences de MonastirUniversité de Monastir Laboratoire de chimie hétérocyclique produits naturels et réactivité.Equipe de chimie médicinale et produits naturels (LR11ES39)Faculté des sciences de MonastirUniversité de Monastir

Objective: To explore anti-inflammatory activities of organic extract and its semi-purified fractions(ethanol, acetone, methanol/dichloromethane) from the Mediterranean gorgonian Eunicella singularis. Methods: The anti-inflammatory and analgesic activities were evaluated, using the carrageenan-induced rat paw edema model and the acetic acid writhing test in mice. The gastroprotective activity was determined using HCl/Et OH induced gastric ulcers in rats. The purification and structure elucidation of compound(s) from the more effective fraction were determined by chromatographic and spectroscopic methods and in comparison with data reported in the literature. Results: The fraction F-Et OH showed an important antiinflammatory activity associated with significant analgesic and gastroprotective properties. The purification and structure elucidation of compound(s) from this fraction lead to the identification of one diterpenoid and four sterols. Conclusions: These results suggested that components from the active fraction can be used to treat various anti-inflammatory diseases.

关键词： Eunicella singularis Anti-inflammatory activity Analgesic activity Gastroprotective effect Diterpenoid Sterols

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